N8KDV wrote:

RHF wrote:

DP,

1. When the radio is not being used the POT is set to Zero and the
Receiver's Antenna Input is Shorted-Out and Grounded.

2. This is a 'set' of both Forward and Reverse Diodes Dual [Doubled]

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If you have enough wide band RF signal levels to make these dual
diodes work then with a modern solid state radio most likely you have
major front-end overload in the radio.


They don't have to be driven into conduction just into the square law region.



Didn't they put this same sort of setup in one of the NRD's (JRC) of yore, only to
discover it caused intermod and had to be removed.?


Some years back, an amateur mfg had varicaps tuning a front end filter- IP3 characteristic
was horrible. The next generation got rid of the idea.

Dale W4OP